Direct Digital Controller
Direct Digital Controller fw 4.013 – Ed. 01/2013
87
4.4.2.5 Split plant part
By means of this menu the separable plant operation parameters can be controlled.
The term
“Separable plant”
means the plant part that can be separated from the base plant by means of
valves) and that can operate independently to provide the DHW service.
The options available in this menu are:
4.4.2.5.1 Heating/DHW
Select
4.4.2.5.2
Set point range
4.4.2.5.3 Water
Differential
4.4.2.5.4 Regulation
parameters
4.4.2.5.5
Robur Box water pumps delay
4.4.2.5.6
Switching-over step timing
4.4.2.5.7
Splitting valve parameters
4.4.2.5.1 Heating/DHW
Select
By means of this sub-menu item, it is possible to choose whether use is made of the machines configured on
the separable plant to produce DHW only (domestic hot water) or to produce (not at the same time) hot water
for the heating plant and DHW (domestic hot water). The latter function allows the units belonging to this part
of the plant (Separable part) to complement the production of hot water for heating purposes if no request for
DHW is present, or to produce domestic hot water if a request of this type is received. The production of
domestic hot water has priority over the request for heating.
1 - Select from the initial screen to gain access to the main menu.
2 - Select
to gain access to the System installation.
3 - Enter the installer password on the numerical keypad that appears on the display.
4 - Select
“Plants”
from the drop-down menu.
5 - Select the plant type:
for two-line cooling/heating plant;
for hot water production plant.
6 - Turn the knob to scroll the cursor downward until highlighting “Splitt.Plant Part” and press the knob to gain
access to the screen.
7 - Select
“Heating/DHW select.”.
8 - Position the cursor on next to the option that is to be set:”Heating and DHW (Alternate Service)” or “DHW
only”.
9 - Press the knob to activate the option. The symbol indicates that the option has been enabled .
10 - To exit, select
.
4.4.2.5.2 Set point range
This option permits to define the
set point temperature limit
(delivery) of the separable plant for the
production of DHW. Then, the set point temperature will be set in the ”User settings” menu, if on the RB100 or
RB200 interface the following option is set: “Digital with set point DDC”; or acquired from Robur Box (RB100 or
RB200). In particular, it is possible to define the
maximum
water temperature for the production of domestic
hot water in the range from 5
÷
95°C (41
÷
203° F). For instance, if for a domestic hot water production plant the
set point limit value is 60°C (140° F), the user can choose a set point value ranging from 5 °C (41° F) to
60°C
(140° F).
Instructions for modifying the set point limits follow:
1 - Select from the initial screen to access the main menu.
2 - Select
to access the
“installation menu”.
3 - Enter the installer password on the numerical keypad that appears on the display.
NOTE
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